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. 2020 Jun 15;10(6):e035420. doi: 10.1136/bmjopen-2019-035420

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Forest plot of the result of univariate analysis for white blood cell (WBC) count. The result of univariate analysis in six studies was pooled for meta-analysis and a total of 242 patients were included. WBC count was significantly associated with all-cause mortality with a mean difference of 1.35 (95% CI 0.19 to 2.51, p=0.02). There was mild heterogeneity with no statistical significance (χ²=6.41, p=0.27, I²=22%). The 95% prediction interval ranged from −1.15 to 3.85.